“And now verily We shall make you turn (in prayer) toward a Qibla which is dear to you. So turn your face toward the Inviolable Place of Worship (the Kaaba of Makkah).” (Al Baqarah 2:144)
The Kaaba or Ka'aba, in the mosque known as Masjid al Haram in Mecca (Makkah), is the holiest place in Islam.
The Qibla, for any point of reference on the Earth, is the direction of the Kaaba. In Muslim religious practice, supplicants must face this direction in prayer. It should be noted that Muslims do not worship the Kaaba or its contents, any more than Christians worship churches or crosses; the Kaaba is simply a focal point for prayer.